Sampled video signal generating device for improving deviation b

Details Sampled video signal generating device for improving deviation b Sampled video signal generating device for improving deviation b

1990-09-28

1992-08-25

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 21R, 358172, H09N 514

Patent

active

051426439

ABSTRACT:
An improved video signal processing circuit (63) in the high quality television system for alternating-current driving a liquid crystal module (64) is disclosed. A reference signal is inserted into vertical blanking periods of a R signal by a reference signal generator (20) and switching circuit (4). The R signal in which the reference signal is inserted in converted into digital signals of n channels by an A/D converter (6). There exists difference in circuit characteristics among signal processing circuits for processing the respective digital signals. However, the signals signal-processed for each channel are supplied to microcomputer 21 through switching circuits (18.sub.1 -18.sub.n). Since the microcomputer 21 controls full scale level and offset level of D/A converters 9.sub.1 -9.sub.n and adders 11.sub.1 -11.sub.n, the deviations produced among sampled video signals due to difference in circuit characteristics among channels can be reduced.

REFERENCES:
patent: 4356508 (1982-10-01), Okada
patent: 4414572 (1983-11-01), Flory
patent: 4754323 (1988-06-01), Kaji et al.
patent: 4766430 (1988-08-01), Gillette et al.
patent: 4901150 (1990-02-01), Klingelhofer et al.
Japanese Patent Laying Open No. 64-32782 (Laying Open date Feb. 1989) (filing date Jul. 1987) and English abstract thereof.
Japanese Patent Laying Open No. 61-198885 (Laying Open date Sep. 1986) (filing date Feb. 1985) and English abstract thereof.
M. Mizuta, "Recording and Reproducing Device" Abstracts of Japan. vol. 11, No. 31, (E-475) [2478]Jan. 29, 1987.

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